i'd say first watch the videos to see what everything is first, then poke around each thing. i haven't tried the Huddle (i think it's called) thing yet but after getting a little use to it, even though this is just the "skeleton" of this site, this does have the good possibility of taking people off FB. it's cleaner, simpler yet still has great features, & NO ADS hahaha
plus, people at Google do listen to their users to improve things... unlike FB which just ignores it's users & does whatever updates it wants, & shares "anonymous data" about you to whoever pays FB to advertise.
if they do this right, i'm leaving FB as soon as i make sure i have everyone i know personally in 1 of my Circles here ^_^